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Commitments and Contingent Liabilities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jul. 31, 2017
Commitments and Contingent Liabilities [Line Items]
Litigation and regulatory matters loss contingency, range of possible loss, maximum (less than)	$ 100.0		$ 100.0
Indonesia \| CT Corp Joint Venture
Commitments and Contingent Liabilities [Line Items]
Joint Venture with CT Corp, Ownership Percentage						49.00%
Commitments \| Commercial mortgage loans
Commitments and Contingent Liabilities [Line Items]
Total outstanding mortgage loan commitments	392.0		392.0		$ 121.0
Allowance for credit losses	0.0		0.0		0.0
Change in allowance for credit loss expense (reversal)	0.0	$ 0.0	0.0	$ 0.0
Commitments \| Investments
Commitments and Contingent Liabilities [Line Items]
Commitments to purchase investment (excluding commercial mortgage loans)	580.0		580.0		753.0
Purchase Commitment
Commitments and Contingent Liabilities [Line Items]
Change in allowance for credit loss expense (reversal)	0.0	$ 0.0	0.0	$ 0.0
Other Guarantees
Commitments and Contingent Liabilities [Line Items]
Accrued liabilities	$ 33.0		$ 33.0		$ 34.0